Question

Answer the following questions:-

1. Give two examples of contact force.

2. Name the force due to which every object falls on earth.

3. Write the types of non-contact force. Also define them.

4. What are the effects of force on an object?

5. How can we change the speed and the direction of a moving body?

6. What do you mean by pressure? What is the SI unit of pressure?

7. Why it is easier to walk on soft sand if we have flat shoes rather than shoes with sharp heels (or pencil heels)?

8. What is meant by atmospheric pressure?​

Answer 1

1. Example : Reaction force and Friction
2. Gravity
3. Gravitational force, magnetic force, electrostatic force and nuclear force
4. A force acting on an object causes the object to change it's shape or size, to start moving, to accelerate or decelerate . When there is the interaction between two objects they exert a force on each other, these exerted forces are equal in size but opposite in direction.
5. We can change the speed and the direction of a moving body by applying force on that moving body or moving object.
6. Pressure is the force applied perpendicular to the surface of an object. The SI unit of pressure is the pascal, equal to one newton per square meter
7. A flat shoe increases the area of contact with the ground. Hence pressure on the ground is much less in case of a flat shoe as a compared to a pencil heeled shoe and walking is easier.
8. The pressure exerted by the weight of the atmosphere which at sea level has mean value of 101,325 pascals.

Answer 2

Explanation:

Hope it helps to you all.